Shannen Doherty Shaves Head As She Battles Cancer

American actress Shannen Doherty is sharing her battle with breast cancer publicly on Instagram.

Joined by her mother and friend, the former Beverly Hills, 90210 star posted a step-by-step process of shaving her head.

"Cupcake pan, chocolates and a razor.... Stay tuned," she wrote on Instagram before posting the images.

The 45-year-old revealed her diagnosis in 2015. "Yes, I have breast cancer, and I am currently undergoing treatment," she told PEOPLE at the time. "I am continuing to eat right, exercise and stay very positive about my life.

"I am thankful to my family, friends and doctors for their support and, of course, my fans who have stood by me."